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The Design and Research for Network Address Space Randomization in OpenFlow Network

Journal of Computer and Communications 2015年第5期3卷 203-211页

作者： Ziyu Zhao Yuanbo Guo Wei Liu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

By allocating IP address and changing IP address in source and destination hosts, network address space randomization is committed to construct a dynamic and heterogeneous network to decrease the attacking possibility and predictability. The research mainly deploys the features of OpenFlow network including data plane and control plane decoupling, centralized control of the network and dynamic updating of forwarding rules, combines the advantages of the network address space randomization technology with the features of the OpenFlow network, and designs a novel resolution towards IP conversion in Floodlight controller. The research can help improve the unpredictability and decrease the possibility of worm attacking and IP sniffing by IP allocation.

关键词： IP Conversion OpenFlow Moving Target Defense Floodlight Hitlist Worms

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Establishment and Application of Cryptographic Library Model

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Journal of Computer and Communications 2015年第5期3卷 21-32页

作者： Tie-Ming Liu Lie-Hui Jiang Jing Jing Yuan-Yuan Zhang The State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

When doing reverse analysis of program’s binary codes, it is often to encounter the function of cryptographic library. In order to reduce workload, a cryptographic library model has been designed by analysts. Models use formalized approach to describe the frame of cryptology and the structure of cryptographic function, complete the mapping from cryptographic function property to its architecture, and accomplish the result presentation of data analysis and mapping at last. The model can solve two problems: the first one is to know the hierarchy of the cryptographic function in the library well;the second one is to know some kinds of information, such as related cryptology algorithm and protocol, etc. These function implements can display the result graphically. The model can find relevant knowledge for the analysts automatically and rapidly, which is helpful to the learning of the overall abstract structure of cryptology.

关键词： Cryptographic Library Model Cryptographic Library Architecture Cryptographic Algorithm Encryption and Decryption keys Encryption and Decryption Data Information Recovery

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Numerical investigation of wave-induced local scour around a submarine pipeline 7

Numerical investigation of wave-induced local scour around a...

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7th International Conference on Scour and Erosion, ICSE 2014

作者： Lu, Lin Liu, Ming-Ming Teng, Bin Tang, Guo-Qiang Zhao, Ming State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian China School of Computing Engineering and Mathematics University of Western Sydney NSW Australia

ISBN: (纸本)9781138027329

A two-dimensional numerical model is developed in this work to predict the local scour around subsea pipelines induced by the orbital fluid motion due to free-surface water waves. Instead of being simplified as an oscillatory flow, the motion of the wave surface is predicted numerically. The numerical model is based on the two-dimensional Reynolds-Averaged Navier-Stokes equations with the Shear-Stress Transport (SST) k-ω turbulence closure. The Petrove Galerkin Finite Element Method (PG-FEM) is used to discretize the governing equations. In order to account for the free surface of water waves and the seabed evolution due to local scour, an Arbitrary Lagrangian-Eulerian (ALE) method is employed. Both suspended and bed load sediment transportation rates are considered to predict the evolution of seabed profile. The numerical model is validated against available numerical results and experimental data of wave propagation over submerged structures and local scour around submarine pipeline in steady current. Then, the numerical simulations are carried out for local scour around a submerged pipeline in water waves. Comparisons with laboratory measurements show that the present numerical model works well in predicting the equilibrium profile of local scour, which sheds lights on the numerical simulations of local scour under waves in shallow water, where the waves are expected to be strongly non-linear. © 2015 Taylor & Francis Group, London.

关键词： Numerical models

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Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition engineering

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Angewandte Chemie 2018年第38期130卷

作者： Hong Wang Lu Wang Qiang Wang Shuyang Ye Wei Sun Yue Shao Zhiping Jiang Qiao Qiao Yimei Zhu Pengfei Song Debao Li Le He Xiaohong Zhang Jiayin Yuan Tom Wu Geoffrey A. Ozin Key Laboratory of Functional Polymer Materials of the Ministry of Education Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China Materials Chemistry and Nanochemistry Research Group Solar Fuels Cluster Centre for Inorganic and Polymeric Nanomaterials Departments of Chemistry Chemical Engineering and Applied Chemistry and Electrical and Computing Engineering University of Toronto 80 St. George Street Toronto Ontario M5S3H6 Canada Institute of Functional Nano & Soft Materials Soochow University Suzhou Jiangsu 215123 P. R. China State Key Laboratory of Coal Conversion Institute of Coal Chemistry The Chinese Academy of Sciences Taiyuan 030001 China Department of Physics Temple University Philadelphia PA 19122 USA Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton NY 11973 USA College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P. R. China Department of Materials and Environmental Chemistry Stockholm University 10691 Stockholm Sweden School of Materials Science and Engineering UNSW Australia Kensington Campus Building E10 Sydney NSW 2052 Australia

Ammonia, a key precursor for fertilizer production, convenient hydrogen carrier, and emerging clean fuel, plays a pivotal role in sustaining life on Earth. Currently, the main route for NH 3 synthesis is by the heterogeneous catalytic Haber–Bosch process (N 2 +3 H 2 →2 NH 3 ), which proceeds under extreme conditions of temperature and pressure with a very large carbon footprint. Herein we report that a pristine nitrogen‐doped nanoporous graphitic carbon membrane (NCM) can electrochemically convert N 2 into NH 3 in an acidic aqueous solution under ambient conditions. The Faradaic efficiency and rate of production of NH 3 on the NCM electrode reach 5.2 % and 0.08 g m −2 h −1 , respectively. Functionalization of the NCM with Au nanoparticles dramatically enhances these performance metrics to 22 % and 0.36 g m −2 h −1 , respectively. As this system offers the potential to be scaled to industrial levels it is highly likely that it might displace the century‐old Haber–Bosch process.

关键词： Elektrokatalyse Funktionalisierung Polymere ionische Flüssigkeiten Poröse Kohlenstoffmembranen Stickstoff-Fixierung

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Wave forces on horizontal cylinder due to nonlinear focused wave groups 25

Wave forces on horizontal cylinder due to nonlinear focused ...

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25th International Ocean and Polar engineering Conference, ISOPE 2015

作者： Gao, Ningbo Yang, Jianmin Li, Xin Zhao, Wenhua State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai China Faculty of Engineering Computing and Mathematics University of Western Australia Perth Australia

ISBN: (纸本)9781880653890

In this study, a numerical wave tank is developed based on commercial software package FLUENT. Velocity inlet method is applied to simulate nonlinear wave groups and compared with 1st order and 2nd order wave theories. The horizontal particle velocity of the focused wave group and regular wave with identical crest height and trough-to-trough period were calculated. Main efforts are devoted to forces on a horizontal cylinder. The comparison of the vertical forces on horizontal cylinder for both nonlinear focused wave group and regular wave with the equivalent trough-to-trough period and wave crest amplitude is conducted. This simulation confirmed that the kinematics of focused wave group is much severe than that regular wave. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Navier Stokes equations

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Innenrücktitelbild: Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition engineering (Angew. Chem. 38/2018)

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Angewandte Chemie 2018年第38期130卷

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Back Cover: Amorphous Ni0.75Fe0.25(OH)2-Decorated Layered Double Perovskite Pr0.5Ba0.5CoO3-δfor Highly Efficient and Stable Water Oxidation (ChemElectroChem 3/2017)

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ChemElectroChem 2017年第3期4卷 747-747页

作者： Prof. Fengli Liang Prof. Jaka Sunarso Prof. Junkui Mao Ziqiong Yang Prof. Wei Zhou College of Energy and Power Engineering Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and Astronautics Nanjing 210016 P.R. China Faculty of Engineering Computing and Science Swinburne University of Technology Jalan Simpang Tiga 93350 Kuching Sarawak Malaysia Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing 210009 P.R. China

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Inside Back Cover: Ambient Electrosynthesis of Ammonia: Electrode Porosity and Composition engineering (Angew. Chem. Int. Ed. 38/2018)

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Angewandte Chemie International Edition 2018年第38期57卷

作者： Dr. Hong Wang Dr. Lu Wang Dr. Qiang Wang Shuyang Ye Dr. Wei Sun Yue Shao Zhiping Jiang Dr. Qiao Qiao Dr. Yimei Zhu Prof. Pengfei Song Dr. Debao Li Prof. Le He Prof. Xiaohong Zhang Prof. Jiayin Yuan Prof. Tom Wu Prof. Geoffrey A. Ozin Key Laboratory of Functional Polymer Materials of the Ministry of Education Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China Materials Chemistry and Nanochemistry Research Group Solar Fuels Cluster Centre for Inorganic and Polymeric Nanomaterials Departments of Chemistry Chemical Engineering and Applied Chemistry and Electrical and Computing Engineering University of Toronto 80 St. George Street Toronto Ontario M5S3H6 Canada Institute of Functional Nano & Soft Materials Soochow University Suzhou Jiangsu 215123 P. R. China State Key Laboratory of Coal Conversion Institute of Coal Chemistry The Chinese Academy of Sciences Taiyuan 030001 China Department of Physics Temple University Philadelphia PA 19122 USA Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton NY 11973 USA College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P. R. China Department of Materials and Environmental Chemistry Stockholm University 10691 Stockholm Sweden School of Materials Science and Engineering UNSW Australia Kensington Campus Building E10 Sydney NSW 2052 Australia

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A multi-scale geometric flow method for molecular structure reconstruction

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Computational Science and Discovery 2015年第1期8卷

作者： Xu, Guoliang Li, Ming Chen, Chong State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics Academy of Mathematics and Systems Science Beijing100190 China

We have previously reported an L2-gradient flow (L2GF) method for cryo-electron tomography and single-particle reconstruction, which has a reasonably good performance. The aim of this paper is to further upgrade both the computational efficiency and accuracy of the L2GF method. In a finite-dimensional space spanned by the radial basis functions, a minimization problem combining a fourth-order geometric flow with an energy decreasing constraint is solved by a bi-gradient method. The bi-gradient method involves a free parameter As β increases from 0 to 1, the structures of the reconstructed function from coarse to fine are captured. The experimental results show that the proposed method yields more desirable results. © 2015 IOP Publishing Ltd.

关键词： Gradient methods

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Quantum state Tomography via Reduced Density Matrices

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Physical Review Letters 2017年第2期118卷 020401-020401页

作者： Tao Xin Dawei Lu Joel Klassen Nengkun Yu Zhengfeng Ji Jianxin Chen Xian Ma Guilu Long Bei Zeng Raymond Laflamme State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Institute for Quantum Computing University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Physics University of Guelph Guelph N1G 2W1 Ontario Canada Centre for Quantum Computation and Intelligent Systems Faculty of Engineering and Information Technology University of Technology Sydney New South Wales 2007 Australia Department of Mathematics and Statistics University of Guelph Guelph N1G 2W1 Ontario Canada State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences 100190 Beijing China Joint Center for Quantum Information and Computer Science University of Maryland College Park Maryland USA Department of Physics and Astronomy University of Waterloo Waterloo Ontario N2L 3G1 Canada Canadian Institute for Advanced Research Toronto M5G 1Z8 Ontario Canada Perimeter Institute for Theoretical Physics Waterloo Ontario N2L 2Y5 Canada

Quantum state tomography via local measurements is an efficient tool for characterizing quantum states. However, it requires that the original global state be uniquely determined (UD) by its local reduced density matrices (RDMs). In this work, we demonstrate for the first time a class of states that are UD by their RDMs under the assumption that the global state is pure, but fail to be UD in the absence of that assumption. This discovery allows us to classify quantum states according to their UD properties, with the requirement that each class be treated distinctly in the practice of simplifying quantum state tomography. Additionally, we experimentally test the feasibility and stability of performing quantum state tomography via the measurement of local RDMs for each class. These theoretical and experimental results demonstrate the advantages and possible pitfalls of quantum state tomography with local measurements.

关键词： Quantum entanglement Quantum information processing Quantum tomography Random matrix theory

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